<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
    *{
        margin:0;
        padding: 0;
    }
    .container{
        margin-left: auto;
        margin-right: auto;
        width: 650px;
        text-align: center;
        overflow: hidden;
    }
    img{
        width: 210px;
    }
    input{
        width:540px;
        height: 40px;
        float:left;
    }
    button{
        font-size: 18px;
        color: #fff;
        background-color: #3388FF;
        border: none;
        height: 44px;
        width: 105px;
        float: left;
    }
    </style>
</head>
<body>
    <div class="container">
        <div>
            <img src="images/bd_logo1.png" alt="">
        </div>
        <input type="text">
        <button>百度一下</button>
    </div>
   
</body>
</html>